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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34055c302cc4c4e7095775268cb9d9c89adfded1b0b2632c06e8d8d0849b4eeb' 
  AND token = 'ylDaes3CzqV+WBfVTTumo+5pZex5S93fJUtcXKjjeuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}